JPH0514003Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is used for dispensing powder and granular materials in storage containers, transport pipes, transport equipment, processing equipment, etc. (hereinafter referred to as storage containers, etc.) for powder and granular materials. This relates to a pneumatically operated impact cylinder used for dropping.

[Prior art] When powder or granules adhere to the walls of a storage container for powder or granules, troubles such as the inability to supply the powder or granules occur, so it is necessary to apply an impact to the walls using an impact cylinder or the like. It is necessary to brush off the adhering powder and granules.

Such an impact cylinder for blowing off powder and granules operated by pressurized air is already known, and the present inventor had previously proposed it in Utility Application No. 129347/1983. .

In this type of cylinder, like the impact cylinder already proposed above, the piston is held until the air pressure rises to a predetermined pressure, and when the air pressure rises sufficiently, the holding is released and the piston is quickly moved. In this case, the piston holding force in the impact cylinder can be easily set by setting the holding force of the piston using the biasing force of a spring opposed to the fluid pressure on the supply side. can.

However, if a spring opposed to the supply-side fluid pressure is provided on a member that generates an impact force, such as a piston, there is a high possibility that the spring will be damaged by the impact load over a long period of time.

[Problems to be solved by the invention] The technical problem of the invention is to provide the spring that sets the holding force of the piston in the impact cylinder for brushing off adhered powder at a position where it is less likely to receive impact loads. The purpose of this invention is to enable the impact cylinder to operate stably over a long period of time, and to further facilitate the adjustment of the impact force.

[Means for solving the problems] In order to solve the above problems, in the present invention,
A piston that slides inside the cylinder body is rapidly driven by supplying pressurized air to a pressure chamber defined between the piston and the cover, and the piston collides with an impact member to generate an impact force. In the impact cylinder for blowing off powder and granular materials, a main flow passage is provided that communicates with the pressure chamber through the cover from the supply/discharge port for supplying and discharging pressurized air, and the piston is provided with a valve seat at the opening edge of the main flow passage on the pressure chamber side. A pilot conduit hole is provided in the cover to communicate the pressure air supply/discharge port side with the pressure chamber, and the pilot valve chamber provided in the pilot conduit hole is connected to the above-mentioned supply/discharge port side. A poppet valve is provided that approaches and separates from the valve seat on the opening edge of the opening and the valve seat on the opening edge leading to the exhaust port, and a valve spring biases the poppet valve against the valve seat on the opening edge on the supply/discharge port side. has been established.

[Operation] Pressurized air is supplied from the supply/discharge port, and when the pressure reaches a pressure that allows the poppet valve provided in the pilot valve chamber to be opened against the biasing force of the valve spring, the poppet valve is opened and the pressure chamber is opened. Pressurized air flows in from the supply/discharge port and presses the piston against the return spring. When the piston begins to move and the valve body installed on the piston opens the main flow path, high-pressure air from the supply and exhaust ports flows into the pressure chamber at once, and the piston is rapidly driven by the acting force, causing an impact. It collides with a member and generates an impact force.

When the air in the pressure chamber is discharged through the supply/discharge port, the piston returns due to the biasing force of the return spring, and as the piston returns, the valve body closes the valve seat in the main flow path.
A poppet valve in the pilot valve chamber communicates the pressure chamber with the exhaust port so that residual pressure in the pressure chamber is vented to the atmosphere.

The holding force of the piston in the impact cylinder can be easily set by adjusting the biasing force of the valve spring. Further, since the valve spring that sets the above-mentioned holding force is provided on the cover, the impact force of the piston does not directly act on the valve spring, and the valve spring operates stably over a long period of time.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which a cylinder body 1 is composed of a cylinder tube 2 and covers 3 and 4 fixed to both ends thereof.

Inside the cylinder body 1 is a cylinder tube 2.
It is divided into a pressure chamber 8 and a breathing chamber 9 by a piston 6 sliding therein, and the piston 6 is provided with a valve body 10 on the pressure chamber 8 side. The above valve body 1
0 is an opening edge on the pressure chamber 8 side in a through hole 13 opened at the center of the valve seat body 12, which is opposed to the valve seat body 12 interposed on the cylinder tube 2 side of the cover 3 that partitions the pressure chamber 8. approaching and separating from the valve seat 14,
It was designed to open and close.

The cover 3 on the pressure chamber side has a tank 16 inside it.
The tank 16 is provided with the valve seat body 1.
The cover 3 is provided with a supply/discharge port 17 for supplying and discharging pressurized air to and from the tank 16.

On the other hand, the cover 3 is provided with a piston operating pressure adjustment mechanism. That is, the cover 3 includes:
A pilot guide hole 18 is provided to communicate the pressure air supply/discharge port 17 side with the pressure chamber 8, and a pilot valve chamber 20 provided in the pilot guide hole 18 is provided with a valve seat 21 on the opening edge on the supply/discharge port 17 side. and a poppet valve 25 that approaches and separates from the valve seat 22 on the edge of the opening leading to the exhaust port 23.
The poppet valve 25 is provided with a valve spring 26 that biases the poppet valve 25 against a valve seat 21 on the edge of the opening on the side of the supply/discharge port 17. This valve spring 26 has a biasing force sufficient to open the poppet valve 25 after the air pressure acting on the poppet valve 25 from the supply/discharge port 17 reaches a pressure sufficient to impact the piston 6. is set to

FIG. 2 shows a structure in which the force of the valve spring 26 acting on the above-mentioned poppet valve 25 can be adjusted. The spring receiver 28 that receives the valve spring 26 is constructed with a screw that can be fixed with a lock nut 29. ing.

Further, the cover 4 of the cylinder body 1 has a breathing chamber 9.
It has a through hole 30 communicating with the side, and a return spring 34 is compressed between the impact member 32 loosely inserted into the through hole 30 and the piston 6.

In the cylinder body 1, the cover 4 is attached to the outer wall surface of a storage container or the like via a striking plate (not shown), so that the tip of the impact member 32 is on the same plane as the outer end surface of the cover 4 as shown in the figure. be.

In FIG. 1, reference numeral 36 is an exhaust hole provided in the breathing chamber 9.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows a state where the supply/discharge port 17 is communicated with the atmosphere by a switching valve (not shown), and the piston 6 is moved to the valve seat body on the cover 3 side by the biasing force of the return spring 34. 12, and the valve body 10 is in contact with the valve seat 14.
is closed. In this case, the poppet valve 25 opens the exhaust port 23 by the biasing force of the valve spring 26, so the pressure chamber 8 is open to the atmosphere.

When pressurized air is supplied to the supply/discharge port 17 through the switching valve, the pressurized air flows into the tank 16 and is accumulated therein. At the beginning of the supply of pressurized air, while the pressure in the tank 16 is low, the poppet valve 25 closes the valve seat 21 on the supply/discharge port 17 side by the valve spring 26, but the air pressure in the tank 16 has not risen sufficiently. When the force of the compressed air acting on the poppet valve 25 becomes greater than the biasing force of the valve spring 26, the poppet valve 25 resists the biasing force of the valve spring 26 and moves toward the valve seat 21.
At the same time, the valve seat 22 of the flow path leading to the exhaust port 23 is closed.

Therefore, the high pressure air in the tank 16 flows into the pressure chamber 8 through the pilot guide hole 18, and the air pressure acts on the piston 6, which has a sufficiently larger pressure area than the valve body 10, so that the piston 6 It starts moving against the urging force. As the piston 6 moves, the valve body 10 separates from the valve seat body 12 and opens the through hole 13, so that the tank 16
The pressurized air inside the pressure chamber 8 suddenly flows into the pressure chamber 8, and as a result, the piston 6 moves rapidly and collides with the impact member 32, generating an impact force, which wipes away the powder particles adhering to the walls of the storage container, etc. be dropped.

Note that, before the poppet valve 25 opens, the pressure within the tank 16 also acts on the valve body 10 in the piston 6, but the pressure acting area of the valve body 10 is relatively small, and the biasing force of the return spring 34 is large. So,
The valve body 10 is never opened directly.

When the switching valve is switched to communicate the supply/discharge port 17 with the atmosphere, the piston 6 returns due to the biasing force of the return spring 34, and the poppet valve 25 reaches the supply/discharge port 17 due to the biasing force of the valve spring 26. Since the valve seat 21 of the flow path is closed and the valve seat 22 leading to the exhaust port 23 is opened at the same time, the air in the pressure chamber 8 is discharged from the pilot chamber 20 through the exhaust port 23 to the atmosphere.

It is necessary to hold the piston 6 until the piston 6 is driven after pressurized air is supplied to the tank 16, but the piston 6 must be held until the pressure in the tank 16 increases to what extent. Kaha,
Since the biasing force of the valve spring 26 is opposed to the biasing force of the pressurized air in the tank 16 acting on the poppet valve 25, it is determined by the biasing force of the valve spring 15.

[Effects of the invention] According to the invention, the valve spring that adjusts the operating pressure of the piston in the impact cylinder is not provided in a part where impact force always acts, such as the piston, and the cover receives less impact load. Since the impact cylinder is provided in the cylinder, the impact cylinder can be operated stably over a long period of time, and the impact force can be adjusted more easily.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention, and FIG. 2 is a sectional view showing a modification of the main part thereof. 1... Cylinder body, 3... Cover, 6... Piston, 8... Pressure chamber, 10... Valve body, 14, 2
1, 22... Valve seat, 17... Supply/discharge port, 18... Pilot guide hole, 20... Pilot valve chamber, 23...
...Exhaust port, 25...Poppet valve, 26...Valve spring, 34...Return spring.

Claims (1)

[Claim for Utility Model Registration] A piston sliding inside the cylinder body is rapidly driven by supplying pressurized air to a pressure chamber defined between the piston and the cover, and the piston collides with an impact member. In an impact cylinder for removing adhered powder particles that generates an impact force, a main flow passage is provided that communicates with the pressure chamber through the cover from the supply/discharge port for supplying and discharging pressurized air, and the main flow passage is connected to the piston. A valve body is provided that comes into contact with and separates from a valve seat on the edge of the opening on the pressure chamber side, a pilot conduit hole is provided in the cover that communicates the pressure chamber with the supply/discharge port side of pressurized air, and a pilot valve provided in the pilot conduit hole is provided. The chamber is provided with a poppet valve that comes into contact with and separates from the valve seat on the opening edge on the supply/discharge port side and the valve seat on the opening edge leading to the exhaust port, and the poppet valve is connected to the valve seat on the opening edge on the supply/discharge port side. An impact cylinder for removing adhered powder and granular material, characterized in that it is provided with a valve spring that biases against.